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86-609: Culverwell Mesolithic Site is a Mesolithic settlement, located on the Isle of Portland , Dorset , England. It is found in the local area known as Culverwell, along the Portland Bill Road. It is within an area of unspoiled countryside, with no past quarrying. The site is maintained by the Association for Portland Archaeology – a small group dedicated to researching, investigating and excavating on Portland. Open days have been held on

172-563: A fetch across the Atlantic Ocean. Following two severe flood events in the 1970s, Weymouth and Portland Borough Council and Wessex Water decided to investigate the structure of the beach, and coastal management schemes that could be built to protect Chiswell and the beach road. In the 1980s it was agreed that a scheme to provide storm protection with a 20% annual exceedance probability to reduce flood depth and duration in more severe storms. Hard engineering techniques were employed in

258-562: A limestone famous for its use in British and world architecture, including St Paul's Cathedral and the United Nations Headquarters , continues to be quarried here. Portland Harbour , in between Portland and Weymouth, is one of the largest man-made harbours in the world. The harbour was made by the building of stone breakwaters between 1848 and 1905. From its inception it was a Royal Navy base, and played prominent roles during

344-533: A flat or maisonette costs £110,500. Crime rates are below average—there were 5.4 burglaries per 1000 households in 2009 and 2010; which is lower than South West England (7.6 per 1000) and significantly lower than England and Wales (11.6 per 1000). Unemployment levels are very low, at 1.9 per cent in July 2011, compared to the British average of 7.7 per cent. The most common religious identity in Weymouth and Portland

430-415: A function of the distance the breakwaters are built from the coast, the direction at which the wave hits the breakwater, and the angle at which the breakwater is built (relative to the coast). Of these three, the angle at which the breakwater is built is most important in the engineered formation of salients. The angle at which the breakwater is built determines the new direction of the waves (after they've hit

516-437: A list of all the things which Portland Race has swallowed up, it would rival Orcus ". Breakwater (structure) Part of a coastal management system, breakwaters are installed parallel to the shore to minimize erosion . On beaches where longshore drift threatens the erosion of beach material, smaller structures on the beach may be installed, usually perpendicular to the water's edge. Their action on waves and current

602-725: A new 600-berth marina and an extension with more on-site facilities were built. Construction was scheduled between October 2007 and the end of 2008, and with its completion and formal opening on 11 June 2009, the venue became the first of the 2012 Olympic Games to be completed. Weymouth Bay and Portland Harbour are used for other water sports – the reliable wind is favourable for wind and kite-surfing . Chesil Beach and Portland Harbour are used regularly for angling, scuba diving to shipwrecks, snorkelling, canoeing, and swimming. The limestone cliffs and quarries are used for rock climbing ; Portland has areas for bouldering and deep water soloing, however sport climbing with bolt protection

688-585: A northbound section through Chiswell and a southbound section through Fortuneswell , then along Chesil Beach and across a bridge to the mainland in Wyke Regis . Formerly the Portland Branch Railway also crossed to the island. The corridor is now a traffic-free walking and cycle path. Local buses are run by FirstGroup , with services to Weymouth. Weymouth is the hub for south Dorset bus routes, with services to Dorchester and local villages. Weymouth

774-517: A rabbit was seen in a quarry, the workers would go home for the day, until the safety of the area had been assured. As of 2006, older Portland residents were said to be 'offended' (sometimes for the benefit of tourists) by the mention of rabbits; this superstition came to national attention in October 2005 when a special batch of advertisement posters were made for the Wallace and Gromit film, The Curse of

860-522: A shallow tidal flat, The Mere, was infilled, and sports fields taken to form a heliport. The station was formally commissioned as HMS Osprey, which then became the largest and busiest military helicopter station in Europe. The base was gradually improved with additional landing areas and one of England's shortest runways, at 229 metres (751 ft). The naval base closed after the end of the Cold War in 1995, and

946-442: A significant saving over revetment breakwaters. An additional rubble mound is sometimes placed in front of the vertical structure in order to absorb wave energy and thus reduce wave reflection and horizontal wave pressure on the vertical wall. Such a design provides additional protection on the sea side and a quay wall on the inner side of the breakwater, but it can enhance wave overtopping . A similar but more sophisticated concept

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1032-584: Is Christianity, at 61.0 per cent, which is slightly above the England and Wales average of 59.3 per cent. The next-largest sector is those with no religion, at 29.3 per cent, also slightly above the average of 25.1 per cent. The A354 road is the only land access to Portland, via Ferry Bridge, connecting to Weymouth and to the wider road network at the A35 trunk road in Dorchester . It runs from Easton , splitting into

1118-651: Is a wave-absorbing caisson, including various types of perforation in the front wall. Such structures have been used successfully in the offshore oil-industry, but also on coastal projects requiring rather low-crested structures (e.g. on an urban promenade where the sea view is an important aspect, as seen in Beirut and Monaco ). In the latter, a project is presently ongoing at the Anse du Portier including 18 wave-absorbing 27 m (89 ft) high caissons. Wave attenuators consist of concrete elements placed horizontally one foot under

1204-585: Is adjoined by the Weymouth Lowlands to the north. Geologically, Portland is separated into two areas; the steeply sloping land at its north end called Underhill , and the larger, gently sloping land to the south, called Tophill . Portland stone lies under Tophill; the strata decline at a shallow angle of around 1.5 degrees, from a height of 151 metres (495 ft) near the Verne in the north, to just above sea level at Portland Bill . The geology of Underhill

1290-530: Is connected to towns and villages along the Jurassic Coast by the Jurassic Coast Bus service, which runs for 142 kilometres (88 mi) from Exeter to Poole , through Sidford , Beer , Seaton , Lyme Regis , Charmouth , Bridport , Abbotsbury , Weymouth, Wool , and Wareham . Trains run from Weymouth to London, Southampton , Bristol and Gloucester but ferries no longer transport passengers to

1376-518: Is designed to absorb the energy of the waves that hit it, either by using mass (e.g. with caissons), or by using a revetment slope (e.g. with rock or concrete armour units). In coastal engineering , a revetment is a land-backed structure whilst a breakwater is a sea-backed structure (i.e. water on both sides). Rubble mound breakwaters use structural voids to dissipate the wave energy. Rubble mound breakwaters consist of piles of stones more or less sorted according to their unit weight: smaller stones for

1462-399: Is different to Tophill; Underhill lies on a steep escarpment composed of Portland Sand, lying above a thicker layer of Kimmeridge Clay , which extends to Chesil Beach and Portland Harbour. This Kimmeridge Clay has resulted in a series of landslides, forming West Weares and East Weares. 2.4 kilometres (1.5 mi) underneath south Dorset lies a layer of Triassic rock salt , and Portland

1548-465: Is intended to slow the longshore drift and discourage mobilisation of beach material. In this usage they are more usually referred to as groynes . Breakwaters reduce the intensity of wave action in inshore waters and thereby provide safe harbourage. Breakwaters may also be small structures designed to protect a gently sloping beach to reduce coastal erosion ; they are placed 100–300 feet (30–90 m) offshore in relatively shallow water. An anchorage

1634-430: Is limited in practice by the natural fracture properties of locally available rock. Shaped concrete armour units (such as Dolos , Xbloc , Tetrapod , etc.) can be provided in up to approximately 40 tonnes (e.g. Jorf Lasfar , Morocco), before they become vulnerable to damage under self weight, wave impact and thermal cracking of the complex shapes during casting/curing. Where the very largest armour units are required for

1720-597: Is one of four locations in the United Kingdom where the salt is thick enough to create stable cavities. Portland Gas applied to excavate 14 caverns to store 1,000,000,000 cubic metres (3.5 × 10  cu ft) of natural gas, which is one per cent of the UK's total annual demand. It was proposed that the caverns should be connected to the National gas grid at Mappowder via a 37-kilometre (23 mi) pipeline. Plans had it that

1806-468: Is one of the United Kingdom's rarest plants. The wild flowers and plants make an excellent habitat for butterflies; over half of the British Isles' 57 butterfly species can be seen on Portland, including varieties that migrate from mainland Europe. Species live on Portland that are rare in the United Kingdom, including the limestone race of the silver-studded blue . The mild seas which almost surround

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1892-809: Is only safe if ships anchored there are protected from the force of powerful waves by some large structure which they can shelter behind. Natural harbours are formed by such barriers as headlands or reefs . Artificial harbours can be created with the help of breakwaters. Mobile harbours, such as the D-Day Mulberry harbours , were floated into position and acted as breakwaters. Some natural harbours, such as those in Plymouth Sound , Portland Harbour , and Cherbourg , have been enhanced or extended by breakwaters made of rock. Types of breakwaters include vertical wall breakwater, mound breakwater and mound with superstructure or composite breakwater. A breakwater structure

1978-535: Is situated approximately halfway along the UNESCO Jurassic Coast World Heritage Site ; the site includes 153 kilometres (95 mi) of the Dorset and east Devon coast that is important for its geology and landforms. The South West Coast Path runs around the coast; it is the United Kingdom's longest national trail at 1,014 kilometres (630 mi). Portland is unusual as it is connected to

2064-675: Is the most common style. Since June 2003 the South West Coast Path National Trail has included 21.3 kilometres (13.2 mi) of coastal walking around the Isle of Portland, including following the A354 Portland Beach Road twice. Isle of Portland has a Non-League football club Portland United F.C. who play at Grove Corner. They also have a youth set up called Portland United youth football Club. Rabbits have long been associated with bad luck on Portland. Use of

2150-818: Is the nearest further education college, which has around 7,500 students from south west England and overseas, about 1500 studying A-Level courses. In 2000, the Weymouth and Portland National Sailing Academy was built in Osprey Quay in Underhill as a centre for sailing in the United Kingdom. Weymouth and Portland's waters were credited by the Royal Yachting Association as the best in Northern Europe. Weymouth and Portland regularly host local, national and international sailing events in their waters; these include

2236-457: Is unique for this period and is also the earliest known structural evidence in England for the extensive use of Portland Jurassic limestone on a living site. Other features on the site include the remains of a low wall, four hearths, and a cooking pit. A ritual feature incorporated into the floor consisted of a sub-triangular stone with a large beach cobble next to it. Vast quantities of stone tools and

2322-449: The 2019 structural changes to local government , Portland is in the Dorset unitary authority , administered by Dorset Council . The whole island forms Portland ward which is one of the 52 wards and elects three members to the council. Portland is an ancient royal manor , and until the 19th century was a separate liberty , with certain judicial functions for the isle held separately from

2408-666: The Cenotaph in Whitehall and half a million gravestones for war cemeteries, and after the Second World War hundreds of thousands of gravestones were hewn for soldiers who had fallen on the Western Front . Portland cement has nothing to do with Portland; it was so named due to its similar colour to Portland stone when mixed with lime and sand. There have been railways in Portland since

2494-457: The 1970s. In 2011 there were 6,312 dwellings in an area of 11.5 square kilometres (2,840 acres), with a population density of 1112 people per km . The population is almost entirely native to the United Kingdom and 93.9 per cent of residents are of white British ethnicity, well above the England and Wales average of 80.5 per cent. The average price of a detached house on Portland in 2010 was £ 194,200; terraced houses are cheaper, at £149,727, and

2580-551: The British Archaeological Reports (BAR). 50°31′24″N 2°26′44″W  /  50.5232°N 2.4455°W  / 50.5232; -2.4455 Isle of Portland The Isle of Portland is a tied island , 6 kilometres (4 mi) long by 2.7 kilometres (1.7 mi) wide, in the English Channel . The southern tip, Portland Bill, lies 8 kilometres (5 mi) south of the resort of Weymouth , forming

2666-453: The East Weares part of the island to control scrub in 2007. The comparatively warm and sunny climate allows species of plants to thrive which do not on the mainland. The limestone soil has low nutrient levels; hence smaller species of wild flowers and grasses are able to grow in the absence of larger species. Portland sea lavender can be found on the higher sea cliffs; unique to Portland, it

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2752-599: The First and Second World Wars ; ships of the Royal Navy and NATO countries worked up and exercised in its waters until 1995. The harbour is now a civilian port and popular recreation area, and was used for the 2012 Olympic Games . The name Portland is used for one of the British Sea Areas , and has been exported as the name of several North American and Australian towns, such as Portland, Victoria , and Portland, Oregon ;

2838-857: The French port of St Malo and the Channel Islands of Guernsey and Jersey . St George's Community Primary School is located in Easton . The only other school on Portland is the Atlantic Academy , an all-through school for pupils aged 3 to 19 based at two different sites. Formerly known as the Isle of Portland Aldridge Community Academy, it formed in 2012 by merging four primary schools and one secondary school. Some students commute to Weymouth or Dorchester to study A-Levels , or to attend other secondary schools nearby. Weymouth College in Melcombe Regis

2924-513: The French; the castle cost £4,964 (equivalent to £4.21 million in 2024 ). It is one of the best preserved castles from this period, and is opened to the public by the custodians English Heritage . In the 17th century, chief architect and Surveyor-General to James I, Inigo Jones , surveyed the area and introduced the local Portland stone to London, using it in his Banqueting House, Whitehall , and for repairs on Old St Paul's Cathedral . His successor, Sir Christopher Wren , an architect and

3010-403: The Isle of Portland has an extensive range of flora and fauna ; the coastline and disused quarries are designated as Sites of Special Scientific Interest . The Isle of Portland SSSI encompasses 352 hectares (870 acres), and includes 17 monitored features ranging from Jurassic fossils, calcareous grassland, rock sea-lavender and nationally scarce butterflies. Sea and migratory birds occupy

3096-861: The J/24 World Championships in 2005, trials for the 2004 Athens Olympics, the ISAF World Championship 2006, the BUSA Fleet Racing Championships, and the RYA Youth National Championships. In 2005, the WPNSA was selected to host sailing events at the 2012 Olympic Games —mainly because the academy had recently been built, so no new venue would have to be provided. However, as part of the South West of England Regional Development Agency 's plans to redevelop Osprey Quay,

3182-563: The Member of Parliament for nearby Weymouth, used six million tons of white Portland limestone to rebuild destroyed parts of the capital after the Great Fire of London of 1666. Well-known buildings in the capital, including St Paul's Cathedral and the eastern front of Buckingham Palace feature the stone. After the First World War, a quarry was opened by The Crown Estate to provide stone for

3268-466: The Newport breakwater. The dissipation of energy and relative calm water created in the lee of the breakwaters often encourage accretion of sediment (as per the design of the breakwater scheme). However, this can lead to excessive salient build up, resulting in tombolo formation, which reduces longshore drift shoreward of the breakwaters. This trapping of sediment can cause adverse effects down-drift of

3354-536: The North , with reference to its similarities with Gibraltar ; its physical geography, isolation, comparatively mild climate, and Underhill 's winding streets. A. E. Housman wrote of the place in his poem, "The Isle of Portland", from A Shropshire Lad . Hilaire Belloc 's book The Cruise of the " Nona " is about sailing near Portland, and the reflections it occasions. He describes Portland Race as "the master terror of our world", and says "... if you were to make

3440-584: The Portland Breakwaters from 1848. For a few years until 2005 Britain's only prison ship , HMP The Weare , was berthed in the harbour. There are two tiers of local government covering Portland, at parish (town) and unitary authority level: Portland Town Council and Dorset Council . The town council is based at the Portland Community Venue, a converted school in Fortuneswell. Since

3526-503: The Portland area dealt with almost 1000 incidents in 2005. Portland lends its name to one of the BBC 's Shipping Forecast regions. There are still two prisons on Portland: HMP The Verne , which until 1949 was a Victorian military fortress, and a Young Offenders' Institution ( HMYOI ) on the Grove clifftop. This was the original prison ( HM Prison Portland ) built for convicts who quarried stone for

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3612-571: The Preservation of Life from Shipwreck stationed a lifeboat at Portland in 1826, which was withdrawn in 1851. Coastal flooding has affected Portland's residents and transport for centuries—the only way off the island by land is along the causeway in the lee of Chesil Beach. At times of extreme floods (about every 10 years) this road link is cut by floods. The low-lying village of Chiswell used to flood on average every 5 years. Chesil Beach occasionally faces severe storms and massive waves, which have

3698-604: The Royal Naval Air Station closed in 1999, although the runway remained in use for Her Majesty's Coastguard Search and Rescue flights as MRCC Portland until 2014. MRCC Portland's area of responsibility extended midway across the English Channel , and from Start Point in Devon to the Dorset/ Hampshire border, covering an area of around 10,400 square kilometres (4,000 sq mi). The 12 Search and Rescue teams in

3784-549: The Second World War Portland was the target of 48 air raids and a total of 532 bombs, although most warships had moved north as Portland was within enemy striking range across the Channel. Mulberry Harbour Phoenix Units can be seen at Black Barge beach, near Portland Castle . Portland was a major embarkation point for Allied forces on D-Day in 1944. Early helicopters were stationed at Portland in 1946–1948, and in 1959

3870-470: The United Kingdom average, and monthly rainfall totals throughout the year are less than the UK average, particularly in summer; this summer minimum of rainfall is not experienced away from the south coast of England. The average annual rainfall of 672.3 millimetres (26.5 in) is well below the UK average of 1,163.0 millimetres (45.8 in). The population of Portland in 2021 was 13,417; this figure has remained around twelve to thirteen thousand since

3956-529: The United Kingdom. Portland averaged 1822.6 hours of sunshine annually between 1991 and 2020, which is 42% of the maximum possible, and 36% above the United Kingdom average of 1402.7 hours. December is the cloudiest month (62.2 hours of sunshine), November the wettest (82.6 millimetres (3.3 in) of rain) and July is the sunniest and driest month (237.4 hours of sunshine, 36.9 millimetres (1.5 in) of rain). Sunshine totals in all months are well above

4042-520: The United States Army Corps of Engineers Coastal engineering manual (available for free online) and elsewhere. For detailed design the use of scaled physical hydraulic models remains the most reliable method for predicting real-life behavior of these complex structures. Breakwaters are subject to damage and overtopping in severe storms. Some may also have the effect of creating unique types of waves that attract surfers, such as The Wedge at

4128-504: The Were-Rabbit . Out of respect for local beliefs the adverts omitted the word 'rabbit' and replaced the film's title with the phrase "Something bunny is going on" . Thomas Hardy described Portland as "the peninsula carved by Time out of a single stone", and named it the Isle of Slingers and Isle of the Race in his Wessex novels; it was the main setting of The Well-Beloved (1897), and

4214-409: The addition of occasional meat. Water came from the nearby Culver Well, and the chert for the stone artefacts came from exposures in the cliffs. The edge of the sea was about 300–400 metres further out than it is presently. In November 1999, Archaeopress published the book Culverwell Mesolithic Habitation Site: Excavation Report and Research Studies , written by Susann Palmer. The book is part of

4300-489: The annual mean is 11.8 °C (53.2 °F). The mild seas that surround Portland act to keep night-time temperatures above freezing, making air frost rare: on average 6.3 days per year — this is far below the United Kingdom's average annual total of 55.6 days of frost. Days with snow lying are equally rare: on average zero to five days per year; almost all winters have no more than one day with snow lying. It may snow or sleet in winter, yet it almost never settles on

4386-597: The beginning of the Viking Age in England is dated to their raid in 793, when they destroyed the abbey on Lindisfarne , their first documented landing occurred in Portland four years earlier, in 789, as recorded in the Anglo-Saxon Chronicle . Three lost Viking ships from Hordaland (the district around Hardanger fjord in west Norway ) landed at Portland Bill. The king's reeve tried to collect taxes from them, but they killed him and sailed on. A castle on

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4472-641: The breakwaters), and in turn the direction that sediment will flow and accumulate over time. The reduced heterogeneity in sea floor landscape introduced by breakwaters can lead to reduced species abundance and diversity in the surrounding ecosystems. As a result of the reduced heterogeneity and decreased depths that breakwaters produce due to sediment build up, the UV exposure and temperature in surrounding waters increase, which may disrupt surrounding ecosystems. There are two main types of offshore breakwater (also called detached breakwater): single and multiple. Single, as

4558-403: The breakwaters, leading to beach sediment starvation and increased coastal erosion . This may then lead to further engineering protection being needed down-drift of the breakwater development. Sediment accumulation in the areas surrounding breakwaters can cause flat areas with reduced depths, which changes the topographic landscape of the seabed. Salient formations as a result of breakwaters are

4644-456: The cliffs in different seasons, sometimes these include rare species which draw ornithologists from around the country. Rare visitors to the surrounding seas include dolphins, seals and basking sharks. Chesil Beach is one of only two sites in Britain where the scaly cricket can be found; unlike any other cricket it is wingless and does not sing or hop. Ten British Primitive goats were introduced to

4730-461: The collided wave energy and prevent the generation of standing waves. As design wave heights get larger, rubble mound breakwaters require larger armour units to resist the wave forces. These armour units can be formed of concrete or natural rock. The largest standard grading for rock armour units given in CIRIA 683 "The Rock Manual" is 10–15 tonnes. Larger gradings may be available, but the ultimate size

4816-461: The core and larger stones as an armour layer protecting the core from wave attack. Rock or concrete armour units on the outside of the structure absorb most of the energy, while gravels or sands prevent the wave energy's continuing through the breakwater core. The slopes of the revetment are typically between 1:1 and 1:2, depending upon the materials used. In shallow water, revetment breakwaters are usually relatively inexpensive. As water depth increases,

4902-751: The current MP is Lloyd Hatton ( Labour ). Weymouth and Portland have been twinned with the town of Holzwickede in North Rhine-Westphalia, Germany since 1986, and the French town of Louviers , in the department of Eure in Normandy, since 1959. The borough and nearby Chickerell have been a Fairtrade Zone since 2007. The Isle of Portland lies in the English Channel , 3 kilometres (2 mi) south of Wyke Regis , and 200 km (120 mi) west-southwest of London, at 50°33′0″N 2°26′24″W  /  50.55000°N 2.44000°W  / 50.55000; -2.44000 (50.55, −2.44). Portland

4988-522: The debris created during their production have been found on the site. The most common tools are microliths , scrapers , knives, chopping tools , pounders and picks . Pierced shell beads have also been found. Some academics estimate that the total Mesolithic population of Britain never exceeded 5000, and it is likely that approximately 20 people lived on the site for at least 20-25 years in 4-5 stone huts. The occupants were possible semi-sedentary, and survived by gathering molluscs and edible plants with

5074-505: The early 19th century. The Merchant's Railway was the earliest—it opened in 1826 (one year after the Stockton and Darlington railway ) and ran from the quarries at the north of Tophill to a pier at Castletown , from where the Portland stone was shipped around the country. The Weymouth and Portland Railway was laid in 1865, and ran from a station in Melcombe Regis , across the Fleet and along

5160-525: The effect of the incident wave, creates waves in phase opposition to the incident wave downstream from the slabs. A submerged flexible mound breakwater can be employed for wave control in shallow water as an advanced alternative to the conventional rigid submerged designs. Further to the fact that, the construction cost of the submerged flexible mound breakwaters is less than that of the conventional submerged breakwaters, ships and marine organisms can pass them, if being deep enough. These marine structures reduce

5246-405: The feature; at 10 metres (about 5 fathoms) deep and 2.4 kilometres (1.3 nmi) long, it causes a tidal race to the south of Portland Bill, the so-called Portland Race. The current only stops for brief periods during the 12 + 1 ⁄ 2 -hour tidal cycle and can reach 4 metres per second (9 mph) at the spring tide of 2 metres (6 ft 7 in). Due to its isolated coastal location,

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5332-406: The free surface, positioned along a line parallel to the coast. Wave attenuators have four slabs facing the sea, one vertical slab, and two slabs facing the land; each slab is separated from the next by a space of 200 millimetres (7.9 in). The row of four sea-facing and two land-facing slabs reflects offshore wave by the action of the volume of water located under it which, made to oscillate under

5418-564: The ground—coastal areas in South West England such as Portland generally experience the mildest winters in the UK. Portland is less affected by the Atlantic storms that Devon and Cornwall experience. The growing season lasts for more than 310 days per year, and the borough is in Hardiness zone 9. Weymouth and Portland, and the rest of the south coast, has the sunniest climate in

5504-538: The harbour from torpedo and submarine attack. Portland Harbour was formed (1848–1905) by the construction of breakwaters, but before that the natural anchorage had hosted ships of the Royal Navy for more than 500 years. It was "the home of the Asdics," a centre for Admiralty research into asdic submarine detection and underwater weapons from 1917 to 1998; the shore base HMS Serepta was renamed HMS Osprey in 1927. During

5590-459: The headland and its tidal race . The current lighthouse was refurbished in 1996 and became remotely controlled. It now contains a visitors' centre giving information and guided tours of the lighthouse. Portland Ledge is an underwater extension of Portland Stone into the English Channel at a place where the depth of Channel is 20 to 40 metres (about 10 to 20 fathoms). Tidal flow is disrupted by

5676-734: The highest in the British Isles, and by far warmer than the United Kingdom average. However, due to the island's proximity to the sea, summers are cooler than the national average, with temperatures rarely climbing to the extremes seen in in-land areas further north. As a result of its coastal extremity and mild winter minimum temperatures, Portland is suitable for plants with the Royal Horticultural Society 's hardiness rating H2. Mean sea surface temperatures range from 7.0 °C (44.6 °F) in February to 17.2 °C (63.0 °F) in August;

5762-409: The island before quarrying continued to destroy them. These particular fields remain untouched from housing or quarrying. Culverwell Mesolithic Site has become a scheduled monument under the Ancient Monuments and Archaeological Areas Act 1979. The site is said to be circa 7500-8500 years old. The site's main feature is the large floor of limestone slabs on top of a shell midden (rubbish dump). The floor

5848-475: The island of Portland. The Bill has three lighthouse towers. The Higher Lighthouse is now a dwelling and holiday apartments whilst the Lower Lighthouse is now a bird observatory and field centre providing records of bird migration and accommodation for visitors, which opened in 1961. The white and red lighthouse on Bill Point replaced the Higher and Lower Lighthouses in 1906. It is a prominent and much photographed feature; an important landmark for ships passing

5934-507: The latter of which was named after the city in Maine , which named itself after the isle. The name is also used for a popular street in Kowloon, Hong Kong , and a parish in Jamaica . Portland has been inhabited since at least the Mesolithic period (the Middle Stone Age )—there is archaeological evidence of Mesolithic inhabitants at the Culverwell Mesolithic Site , near Portland Bill , and of habitation since then. The Romans occupied Portland, reputedly calling it Vindelis . Although

6020-469: The low isthmus behind Chesil Beach to a station at Victoria Square in Chiswell . At the end of the 19th century the line was extended to the top of the island as the Easton and Church Ope Railway, running through Castletown and ascending the cliffs at East Weares, to loop back north to a station in Easton . The line closed to passengers in 1952, and the final goods train (and two passenger 'specials') ran in April 1965. The Royal National Institution for

6106-432: The mainland at Abbotsbury by Chesil Beach , a tombolo which runs 29 kilometres (18 mi) north-west to West Bay . Portland is sometimes defined incorrectly as a tombolo—in fact Portland is a tied island, and Chesil Beach is the tombolo (a spit joined to land at both ends). There are eight settlements on Portland, the largest being Fortuneswell in Underhill and Easton on Tophill. Castletown and Chiswell are

6192-450: The material requirements—and hence costs—increase significantly. Caisson breakwaters typically have vertical sides and are usually erected where it is desirable to berth one or more vessels on the inner face of the breakwater. They use the mass of the caisson and the fill within it to resist the overturning forces applied by waves hitting them. They are relatively expensive to construct in shallow water, but in deeper sites they can offer

6278-623: The most exposed locations in very deep water, armour units are most often formed of concrete cubes, which have been used up to ~ 195 tonnes Archived 2019-05-12 at the Wayback Machine for the tip of the breakwater at Punta Langosteira near La Coruña, Spain. Preliminary design of armour unit size is often undertaken using the Hudson's equation , Van der Meer and more recently Van Gent et al.; these methods are all described in CIRIA 683 "The Rock Manual" and

6364-438: The name is still taboo—the creatures are often referred to as "underground mutton", "long-eared furry things" or just "bunnies". The origin of this superstition is obscure (there is no record of it before the 1920s) but it is believed to derive from quarry workers. They would see rabbits emerging from their burrows immediately before a rock fall and blame them for increasing the risk of dangerous, sometimes deadly, landslides . If

6450-414: The name suggests, means the breakwater consists of one unbroken barrier, while multiple breakwaters (in numbers anywhere from two to twenty) are positioned with gaps in between (160–980 feet or 50–300 metres). The length of the gap is largely governed by the interacting wavelengths. Breakwaters may be either fixed or floating, and impermeable or permeable to allow sediment transfer shoreward of the structures,

6536-460: The other villages in Underhill, and Weston , Southwell , Wakeham and the Grove are on the Tophill plateau. Many old buildings are built out of Portland Stone; several parts have been designated Conservation Areas to preserve the unique character the older settlements which date back hundreds of years. The Isle of Portland has been designated by Natural England as National Character Area 137. It

6622-399: The rest of Dorset. The whole isle was also an ancient parish ; the original parish church was St Andrew's at Church Ope Cove on the east side of the island, which was replaced by St George's Church in the eighteenth century after St Andrew's was damaged by landslips. The isle was gradually divided into smaller ecclesiastical parishes , but remained a single civil parish . The parish

6708-458: The scheme, including a gabion running 550 metres (600 yd) to the north of Chiswell, an extended sea wall in Chesil Cove , and a culvert running from inside the beach, underneath the beach road and into Portland Harbour , to divert flood water away from low-lying areas. At the start of the First World War, HMS Hood was sunk in the passage between the southern breakwaters to protect

6794-468: The site of the present Rufus Castle , standing over Church Ope Cove , may have been built for William II of England (also known as William Rufus) soon after the conquest of England by his father William the Conqueror . None of that castle remains; the existing castle probably dates from the 15th century. In 1539 King Henry VIII ordered the construction of Portland Castle for defence against attacks by

6880-545: The site, where guided tours take place of the preserved site, showing and explaining the visible remains and artefacts and how Mesolithic people lived. In 2004, the Culverwell Mesolithic Site won an archaeological award; the prestigious "Pitt Rivers Award", for developing this Mesolithic site on Portland. The surrounding fields between the Bill and Southwell are made up of an ancient strip field system, once found all over

6966-524: The southernmost point of the county of Dorset , England. A barrier beach called Chesil Beach joins Portland with mainland England . The A354 road passes down the Portland end of the beach and then over the Fleet Lagoon by bridge to the mainland. The population of Portland is 13,417. Portland is a central part of the Jurassic Coast , a World Heritage Site on the Dorset and east Devon coast, important for its geology and landforms. Portland stone ,

7052-451: The surface facilities should be complete to store the first gas in 2011, and the entire cavern space available for storage in winter 2013. As part of the £350 million scheme, the Grade II listed former Old Engine Shed would be converted into a £1.5 million educational centre with a café and an exhibition space about the geology of Portland. Portland Bill is the southern tip of

7138-479: The tied island produce a temperate climate ( Köppen climate classification Cfb ) with a small variation in daily and annual temperatures. The average annual mean temperature from 1991 to 2020 was 11.5 °C (52.7 °F). The warmest month is August, which has an average temperature range of 14.8 to 19.5 °C (58.6 to 67.1 °F), and the coolest is February, which has a range of 4.7 to 8.4 °C (40.5 to 47.1 °F). Mean winter temperatures are amongst

7224-543: Was created for the former urban district, with its council taking the name Portland Town Council. The town council continued to be based at the old urban district council's building at Fortuneswell until 2016. In 2019, the borough of Weymouth and Portland was abolished when Dorset moved to a unitary authority structure of local government. Portland forms part of the South Dorset parliamentary constituency , created in 1885. The constituency elects one Member of Parliament;

7310-628: Was featured in The Trumpet-Major (1880). The cottage that now houses Portland Museum was the inspiration for the heroine's house in The Well-Beloved . Portlanders were expert stone-throwers in the defence of their land, and Hardy's Isle of Slingers is heavily based on Portland; the Street of Wells representing Fortuneswell and The Beal Portland Bill. Hardy also called Portland the Gibraltar of

7396-471: Was made a local government district in 1867, governed by an elected local board. Such districts were reconstituted as urban districts in 1894. In 1933/1934, Portland Urban District Council built itself a new headquarters at 3 Fortuneswell. Portland Urban District was abolished in 1974 under the Local Government Act 1972 to become part of the borough of Weymouth and Portland . A successor parish

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